puppeteer/lib/helper.js

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/**
* Copyright 2017 Google Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
class Helper {
/**
* @param {function()} fun
* @param {!Array<*>} args
* @return {string}
*/
static evaluationString(fun, ...args) {
return `(${fun})(${args.map(x => JSON.stringify(x)).join(',')})`;
}
/**
* @param {!Connection} client
* @param {!Object} exceptionDetails
* @return {string}
*/
static async getExceptionMessage(client, exceptionDetails) {
let message = '';
let exception = exceptionDetails.exception;
if (exception) {
let response = await client.send('Runtime.callFunctionOn', {
objectId: exception.objectId,
functionDeclaration: 'function() { return this.message; }',
returnByValue: true,
});
message = response.result.value;
} else {
message = exceptionDetails.text;
}
if (exceptionDetails.stackTrace) {
for (let callframe of exceptionDetails.stackTrace.callFrames) {
let location = callframe.url + ':' + callframe.lineNumber + ':' + callframe.columnNumber;
let functionName = callframe.functionName || '<anonymous>';
message += `\n at ${functionName} (${location})`;
}
}
return message;
}
}
module.exports = Helper;